摘   要：根据Polytec公司的面内振动测量仪所测得的超声电机定子的面内超声振动信号，基于FFT法，自行研发设计面内超声振动频谱分析系统，得出超声电机定子面内振动的各阶模态频率，为超声电机设计和研究者提供可靠的研究数据。
关键词： FFT；面内超声振动信号；频谱分析

Abstract: According to the in-plane ultrasonic vibration of the stator measured by the laser Doppler vibrometer,using the FFT method, and developed an in-plane ultrasonic vibration spectrum analysis system,and obtained the modal frequency which can be used for designers  and researcher.
Key Words: FFT；In-plane ultrasonic vibration signal;Spectrum analysis